Air-preheating attachment for oil burners



S ept. 7,1926.

F. A. ROBINSON AIR PREHEATING ATTACHMENT FOR OIL BURNERS -Fi1 ed July 11. 1925 n a a w .ww M Jr Q5 r k \\\k& y "m 1K i w d W e 0 1 h w 1 2. W 0 Li: 7 7 j 0 Patented Sept. 7, 1926.

-TE m ret- FREDERICK A. 'BOBTLH OF BQSLINDALE, MASSACHUSETTS.

Am,-rnnnnnrme a r-Teen MIENT FOR rOIL TBURNERS.

- Iiip ucauonrieaxui 111, 1925. Serial No.42,933.'

Thisinventionrelates to liquid fuel burners and particularly to air pre-heating attachments therefor,and has for its object to provide ,a novel device whlch may be detachably mounted upon that type of burner,

said device being so connected to the base member of said burner. that air may pass upwardlythrough said burner and thenibe conducted in a serpentine or circuitous path thereabove in such a manner that it will be" exposed to the heat of the flame from said burner, the heated air then being discharged downwardly toward the fuel nozzle of said burner where theair will :aid in thevaporr zation ofthe fuel, causing a completecombustion of the latter and an extremelyhot and efficient flame.

In the embodiment of my invention se and description here-' lected for illustration in, a

Figure 1 represents a planof one form of an oil burnerandian iairzpredieatingt attachment therefor embodying my invention; and] I Fig. 2 is" a central vertical. sectiontakeu ontheline -2.2 of Fig. 1.

Likenumerals refer to likepartsthroughoutthe-severalviews of the drawings.

In the drawings, 5 represents the base memberofra burner of. the typeifrequently employed in furnaces, heatersand the like, and utilizingv oil as a fuel. The base-anemberfi has an air chamber 6 and isalso pro videdat one end witlra depressed top portion surface or oil trap 7 at' the center of which an oil distributing nozzle8 is mounted, said nozzle having afuel supply pipe 9 communicating therewith. I l

Thebase member 5 has a herein circular neck110 projecting upwardly from the upper surface at one end, and forming an air outlet 11 from the air chamber 6. Mounted uponthe base 5is an. air conductor or H- shaped flue member 12 embodying therein an'upright flue 13having, an inlet air passage 14 extending'therethrouglruand communicating with the passagell inn'eek 10, and a secondiflue like portion 15 having a discharge passage 16 for air extending therethrough, said portions lg andi 15 being joined together near their lower ends by. an intermediate connecting rib portion 17, forming with theflue walls an airv heating chamber 18 communicating with the d1schargepassage 116. Thisair heating chamberacts to heat .thev air therein .to a high degree of temperature as the chamber is provided with onlya small opening, with the result that the air therein circulates very slowly, if at all.

17 from becoming overheated, but it also acts tomaintain ust beneath the main air which effectively maintains in thesaid preheater a high temperature not only while the burner is in operation, but also after it, has been shut off,-suc h a high degree of temperature as to prevent the said preheater from cooling rapidly, thus maintaining; it in a heated condition in-anticipation of its use as soon as the burner is againxput in Operation. This -H-shaped flue member makes it possible to support the flue 15 from and by thefiue 13 without supports on or' nearthe burner of. theflue 15, these supports of any-kind being always an objectionable feature because they collect soot and dirt and also interfere with the 'free space for the flame. Furthermore, the H-shaped flue member enables me to connect the lines with the preheater without bolts ,or screwswhich warp under heat and throw'themembers out of,alignment,particularly the preheat er, and. thus interfere with the effectiveness of the burner. Again, the'parts being unbolted may be readily separated in the fire pot of the heater which could not otherwise be done. The "flue 13 of the air flue member projection21 formed upon the upper sur face of the basemember 5 and acts to hold the fine member 12.. in its normal position. with the opening. ofrthe dischargepassage 16Ylocated directlyabove the fuel nozzle'S.

Theflange 19and projection 21 serveto support themember 12 when it is desired: to clean-the fuel nozzle 8, or for other reasons V This-hot air chamber acts 1n turnnot onlyito, prevent the webs 12 and it may be desirable to swing the flue-member 12 from its normal position above saidfuel nozzle At such times theair flue member 12 is raised upon the neck 10 until the flange 19 clears the top of the post 21, and said flue member is then swung either to the right or left into a position where convenient access may be had to the fuel nozzle 8 to clean it atwhich time the flange 19 will rest upon the top of the post 21.

The upper end of the flue 13 of the flue member 12 has a flange 22, and the upper end of the flue 15 of said flue member has a flange 23 formed to receive suitable packing. Mounted upon the top of the flue member 12 and connecting said flues 13, 15, for effectively pro-heating the air for the burner is a pro-heating member 21, having therein an inlet neck, 25 a discharge neck 26, and an intermediate serpentine-shaped or circuitous conduit portion 27. l he inlet neck 25 rests, as stated, within the neck 13 and communicates with the inlet passage 14:, while the neck 26 of said heating member 26% rests within the neck 15 and communicates with the discharge passage 16 thereof. A suitable packing material 28 is located within the flange 2 for the purpose of making the joint tight, and similar packing material 29 is located within the flange 23 for a similar purpose. 7

The general operation of the device is as follows: Assuming that the various parts are positioned as illustrated in the drawings, and fuel oil is being delivered to the nozzle 8 through the fuel supply pipe 9, air passing upwardly through the base member 5 of the burner and through the air outlet 11 formed therein passes through the air passage ll of the flue member 12 and into and through the flue connecting preheater 2 from which said air passes downwardly through the passage 16 of the flue member 12 and is delivered against the upper surface of the fuel nozzle 8.

The oil is first ignited in any well known manner, as by a wick provided for the purpose upon the base of the burner, and the flame passes upwardly around the flue member 12 and between the bonds or turns of the serpentine-shaped flue connector and preheater 2a, thereby effectively pre-heating the air that is delivered to the fuel nozzle, and said heated air aids materially in vaporizing the fuel as it is discnarged from the nozzle, with the result that there is a more complete combustion of the fuel and a very hot and eificient flame is produced. The heated air furthermore, tends to reduce the amount of soot that is generally created when unheated air is delivered to the burner.

IVhen it is found necessary to clean the fuel nozzle, the same is accomplished, as stated, by raising the flue member 12 and theheater 2st mounted thereon until the flange 19 becomes disengaged from the locking post 21,- after which said members may be swung to either side of the nozzle about the neck 10 as may be desired. At such times, the flange l9 rests upon the upper extremity of the post 21.

Claims:

1. In combination, a burner base, an air flue member mounted upon said base and provided with inlet and discharge flues and an air heating chamber, an air heating member mounted upon said flue member and communicating with said flues, said flue member discharging heated air from said heating nember above said base.

2. In combination, a burner base, an air flue member mounted upon said base and provided with inlet and discharge flues and an air heating chamber, an air heating member of serpentine form mounted upon said flue member and communicating with said flues, said flue member discharging heated air from said heating member downwardly against said base.

3. In combination, a burner base provided with an air passage extending therethrough and an oil trap, and a neck, an r-l-shaped air flue member mounted upon said base and adapted to swing upon said neck, said flue member being provided with an inlet flue communicating with the air passage of said base and also with a discharge flue, and a multi-folded air heating member mounted upon said flue member and communicating with said inlet and discharge flues, said member discharging heated air from said heating member above said base.

i. In combination, a burner base provided with a burner and an air passage extending therethrough, the base having a neck, an air flue member for air mounted upon said base and adapted to swing upon said neck, said conductor being provided with an inlet passage communicating with the air passage of said base and also with a discharge passage extending therethrough, an air heat ing member with a zig zag passage mounted upon said flue member and communicating with said inlet and discharge flues, said member discharging heated air from said heating member above said base, and means upon the base to interlock with said flue member and hold the latter in its normal position thereon.

5. In combination, a burner base provided with an air passage extending therethrough, a burner, an oil trap, the base having a neck, an air flue member for air mounted upon said base and adapted to swing upon said neck, said flue member being provided with an inlet passage communicating with the air passage of said base and also with a discharge passage, an air heating member with a sinuous passage mounted upon said member and communicating with said inlet and discharge flues, said members discharging heated air from the heating member above the base, and means comprising a post upon said base to interlock with said flue member and hold the latter in its normal position thereon, said member also having a supporting flange formedthereon adapted to engage said post when said flue member is raised and swung into an abnormal position relatively to said base.

6. Liquid fuel heating means comprising a base member having an airoutlet, a burner, a flue member supporting post on the base, a flue member comprising a plurality of flues and a heating chamber, an air preheating member providing a circuitous path connecting said flues, a flue member having an arc-shaped flange at its lower end constructed and arranged to ride upon said supporting member when the former is turned about the base air outlet to permit access to the nozzle when-disassembling the several parts.

7. Liquid fuel heating means comprising a base member with a burner and an air outlet, a flue member thereover having an upright flue connecting with the base air outlet, a second upright flue positioned over the burner, and a serpentine shaped air preheating member connecting the upper ends of said flues.

8. Liquid fuel heating means comprising a base member having an air outlet and a burner, a flue member therefor comprising a plurality of fines with a heating chamber th'erebet-ween, one for registering with the base air outlet and a second flue registering with the burner, and an air preheating member providing a tortuous path between the fines. I

' 9. Liquid fuel heating means comprising a base with a burner and an air outlet, a flue member with a plurality of lines, one of which registers with the air outlet of the base, while a second fiue has an outlet adjacent the burner, and a flue connecting air preheating member folded upon itself a plurality of times and providing a passage with a plurality of folds between said fines.

10. Liquid fuel heating means comprising a base member having an air outletand a burner, a fluemember therefor, comprising a plurality of fines, one of which supports a second flue over the burner, one flue registering with the base'air outlet, and an air preheating chamber supported between and by said flues and providing a'tortuous path therebetween. y

In testimony whereof I have hereunto set my hand.

FREDERICK A. ROBINSON. 

